ST. LOUIS (KSDK) – An armed man stole a woman's cellphone Sunday night at the St. Louis University campus.

The female student was walking near Tegeler Hall toward the University Garage at Olive and Compton when a male approached her from behind, placing an unknown object behind her head and demanding her cell phone.

The victim complied, and the suspect ran off toward Lindell and Granad.

He is described as an African American male in his 20s, around 5'9" wearing a black coat.

Both campus and city police responded to the crime, and SLU campus security has stepped up patrols in the area.